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Rental Equipment
 3 Months Ended
Mar. 31, 2025
Property, Plant and Equipment [Abstract]  
Rental Equipment Rental Equipment
The following table summarizes our rental equipment and accumulated depreciation as of the dates presented:
March 31, December 31,
20252024
Compressor units$585,043 $579,373 
Work-in-progress53,979 51,662 
639,022 631,035 
Accumulated depreciation(214,166)(216,014)
Rental equipment, net of accumulated depreciation$424,856 $415,021 
We evaluated our rental equipment for potential impairments as of March 31, 2025, and December 31, 2024 and determined that none were present. Depreciation expense for rental equipment was $7.7 million and $6.5 million for the three months ended March 31, 2025, and 2024, respectively. We capitalized interest totaling approximately $0.6 million and $1.2 million, for the three months ended March 31, 2025, and 2024, respectively. As of March 31, 2025, we had approximately $30.0 million of compressor units in work-in-process that were substantially complete, but awaiting final shipment to our customer locations, upon which we did not capitalize interest at the end of the period. The reduction in capitalized interest for the 2025 period was due to the cessation of capitalization on the large number of units that were substantially complete as noted.